I don't think you can use baint on fhéir for cutting the grass- believe thats exclusively for cutting the grass to make hay with a speal (scythe).
Cutting the grass in general is bearradh or gearradh an fhéir.
ag baint an fhomhair- harvesting
There's loads- here's a list of examples:
http://www.focal.ie/Search.aspx?term=baintscroll down to gluaiseanna breise.
Baint amach also means to find (a place)- Bhain mé an pháirc amach- I found the park and I arrived at it.
I'm not sure wether you can use baint amach for finding things:
In this case I would use the verb to come: Tháinig mé ar m' eochracha
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Is Fearr súil romhainn ná ḋá ṡúil inár ndiaiḋ
(Amhlaoibh Ó Súilleabháin)
Please wait for corrections/ more input from other forum members before acting on advice
I'm familiar with Munster Irish/ Gaolainn na Mumhan (GM) and the Official Standard/an Caighdeán Oifigiúil (CO)